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2维水动力模型中入流边界优化处理方法
(1.西安理工大学 西北旱区生态水利国家重点实验室，陕西 西安 710048;2.河海大学 水文水资源学院，江苏 南京 210024;3.中国水利水电科学研究院，北京 100038)
Inflow Boundary Optimized Method in Two-dimensional Hydrodynamic Model
(1.State Key Lab. of Eco-hydraulics in Northwest Arid Region of China, Xi’an Univ. of Technol., Xi’an 710048, China;2.College of Hydrology and Water Resources, Hohai Univ., Nanjing 210024, China;3.China Inst. of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract:With the increasing frequency and intensity of extreme rainstorms, the flood management situation has become extremely severe. It is particularly important to study the process of river flood propagation, overflow and inundation and evaluate the risk of flood disaster effectively. To simulate the river flood propagation accurately, a two-dimensional hydrodynamic model using the finite volume method based on unstructured grids was applied, an improved inflow boundary processing method was proposed based on Ghost-Cell Method. The method of profile extraction based on terrain grid data was used to determine the position of thalweg approximately, and thus to calculate the average gradient of the river. The corresponding water level under different discharge was calculated by defining that the flow on the grid of inflow boundary is the uniform flow. The discharge per unit width was distributed reasonably by calculating the weight according to the water depth and inflow boundary length of each grid, and coupled to flux part of the model for calculation by determining the hydraulic elements on the ghost cell outside the boundary . The method was applied to the simulation of the physical model test of the Toce river, and the flow state near the inflow boundary was more reasonable. The water level at gauging points in the river is in good agreement with the measured data. The arrival time and travel time of flood at gauging points is close to the measured values. The NSE (Nash-Sutcliffe efficiency coefficient) is between 0.82 and 0.95, which verifies the feasibility of the method and the accuracy of the model. And it takes 86 s to complete the calculation on the personal computer, which shows that the model can simulate flood propagation process efficiently and accurately. Through the improvement and optimization of the inflow module, this model can be better applied to the simulation, early warning and disaster assessment of flood propagation process, and provides more powerful technical support for flood disaster management and decision.
keywords:

HOU Jingming,WANG Yu,ZHANG Zhaoan,LI Bingyao,WANG Junhui,ZHANG Dawei.Inflow Boundary Optimized Method in Two-dimensional Hydrodynamic Model[J].Advanced Engineering Sciences,2022,54(4):39-46.